CN107222929B - A method of it avoids interfering between wireless body area network - Google Patents
A method of it avoids interfering between wireless body area network Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
- H04W72/541—Allocation or scheduling criteria for wireless resources based on quality criteria using the level of interference
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/382—Monitoring; Testing of propagation channels for resource allocation, admission control or handover
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
- H04W72/542—Allocation or scheduling criteria for wireless resources based on quality criteria using measured or perceived quality
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/08—Non-scheduled access, e.g. ALOHA
- H04W74/0808—Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA]
- H04W74/0816—Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA] with collision avoidance
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/08—Non-scheduled access, e.g. ALOHA
- H04W74/0833—Random access procedures, e.g. with 4-step access
- H04W74/0841—Random access procedures, e.g. with 4-step access with collision treatment
- H04W74/085—Random access procedures, e.g. with 4-step access with collision treatment collision avoidance
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
- H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
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Abstract
The invention discloses a kind of methods for avoiding interfering between wireless body area network, include the following steps: the network interferences parameter of measurement with each node in statistics body area network；Network interferences parameter is converted delay parameter D by coordinator, further according to delay parameter D and the significant coefficient of node, seeks average delay Dp；Coordinator measures the handling capacity of present channel by successful data reception, and obtains received signal strength by the power of successful data reception packet；Coordinator combines the handling capacity of network and received signal strength with average delay Dp, judges interference strength；Coordinator carries out channel idle detection to channel, obtains optimal idle channel；All node broadcasts Frequency Hopping Signals of the coordinator into this body area network, so that whole network is adjusted on optimal idle channel.The present invention realizes the detection of interference and the adaptive adjusting of network, solves the problems, such as to interfere between body area network using each node pair and the Distributed Detection for interfering related network performance parameter.
Description
Technical field
The present invention relates to the detection interfered between body area network, quick preferred channels detection technique field more particularly to one kind to keep away
The method for exempting to interfere between wireless body area network.
Background technique
With the development of wearable device, body area network is also become more and more popular, while the user of body area network increases,
Also some problems are brought.In a small spatial dimension, there are multiple body area network user jobs in the same channel, it is more
A user may send information simultaneously, so as to cause the failure of information transmission, cause the decline of network performance, this phenomenon is exactly
Interference in wireless body area network between body area network.There are two the odjective causes that this interference generates, and is that number of channels available has first
Limit, IEEE802.15.4 defines 26 channels in total, and it only has 16 in the channel of 2.4GHZ, therefore channel quantity has
Limit, so multiple body area network users are very big a possibility that being in the same channel；Followed by when multiple in the same channel
When user is gathered in a small space, the information of network transmitting will receive the shadow of the body area network user of other cochannels around
It rings, it is this to influence unavoidably.Therefore it tries every possible means to mitigate this interference, and the performance of body area network is remained at normally
It is the research emphasis of wireless body area network interference in the range of work.
The interference that traditional interference avoidance technique cannot be adapted to the technologies such as body area network, such as wifi is one static dry
It disturbs, and the interference between body area network is one dynamic, the channel circumstance moment of surrounding is changing；Body area network and traditional communication network
Network is different, body area network there is no the central adjusting device of similar base station, can macroscopic view adjust the channel distribution in a region, prevent
Interference, it is therefore desirable to which network self-adapting is adjusted；In addition, the more existing channel search strategy for body area network is time-consuming serious,
Interference can be allowed to generate lasting influence to body area network, therefore we need the characteristics of being interfered according to body area network one interference of design to keep away
Exempt from algorithm and it is allowed quickly to restore normal from interference.
Summary of the invention
In order to overcome shortcoming and deficiency of the existing technology, the present invention, which provides, a kind of to be avoided interfering between wireless body area network
Method solves the problem of interference problem of dynamic environment, network self-adapting is adjusted and is interfered and restores normal time-consuming tight
The problem of weight.
In order to solve the above technical problems, the invention provides the following technical scheme: a kind of avoid interfering between wireless body area network
Method includes the following steps:
The network interferences parameter of each node in S1, measurement and statistics body area network, and network interferences parameter is sent to association
Adjust device；
Received network interferences parameter is converted delay parameter D by S2, coordinator, further according to node each in body area network
Delay parameter D and node significant coefficient, seek average delay Dp；
S3, coordinator are handled up by the whole network that successful data reception in its unit time measures present channel
Amount, and received signal strength is obtained by the power of successful data reception packet；
S4, coordinator combine the handling capacity of network and received signal strength with average delay Dp, judge interference strength；
Wherein, network throughput is lower, then average delay Dp is bigger, and the interference being subject to is stronger, therefore when average delay Dp is more than certain
Value and handling capacity as low as certain value when, then judge interfere especially severe；When judging interference strength, if the interference being subject to is tight
Weight then enters next step S5, otherwise returns to step S1；
S5, coordinator carry out channel idle detection to channel, repeat to detect n wheel, each round detection is required to k channel
In one detected, by the sequence of algorithm reasonable arrangement Channel Detection, quickly obtain optimal idle channel；
All node broadcasts Frequency Hopping Signals of S6, coordinator into this body area network change frequency to optimal idle channel
Locating frequency, so that whole network is adjusted on optimal idle channel, then return step S1 carries out loop cycle.
Further, the network interferences parameter of the step S1 includes keeping out of the way number and number of retransmissions.
Further, the delay parameter D of the step S2 and average time delay D p, calculation are as follows:
Wherein the characteristics of non-slot CSMA/CA is utilized in delay parameter D, is calculated according to the following formula:
In formula, nb indicates to keep out of the way number, W in CSMA/CA agreementnbIndicate contention window size, TslotIndicate that unit is moved back
The slot length kept away；The formula is used to calculate one when backoff state is nb and average keeps out of the way time-consuming；
In formula,It indicates average and keeps out of the way number,Indicate that number of retransmissions, N indicate maximum allowable and keep out of the way number；The formula
Number and average repeat time are kept out of the way in being averaged for indicating to send using the node, and estimation obtains the average delay D of the node-node transmission；
In formula, αiIndicate that the significant coefficient of node i, k represent total number of nodes；Consider the important of each node of whole network
Property, obtain the average delay D based on node priority of network entiretyp。
Further, in the step S4, when judging interference strength, determine whether seriously to be done using threshold method
It disturbs, specifically: when handling capacity is lower than throughput threshold, average delay is higher than the threshold value of average delay, and received signal strength
Greater than received signal strength threshold value when, it is believed that the serious interference being subject to；The data volume that coordinator is sent according to each node of network
To determine the threshold value of handling capacity and the threshold value of average time delay D p, network throughput T of the coordinator measurement under noiseless, setting system
Number α, using α × T as the threshold value of handling capacity；Coordinator measures average delay Dpt noiseless under, setting factor beta, with β ×
Threshold value of the Dpt as average delay Dpt；Testing unobstructed lower received signal strength indication is rssi1, tests single barrier and blocks
Under received signal strength indication be rssi2, set the threshold value of received signal strength as rssi1- γ × rssi1+ γ × rssi2,
Coefficient gamma ∈ [0,1] is body area network to the tolerance blocked.
Further, the step S5, specifically:
S51, coordinator set total Channel Detection wheel number as n and total detection number of channel k, initialize each channel
By the average reward of selection number and each channel；
S52, in each round detection, coordinator randomly chooses channel with ε probability and carries out channel idle detection, with 1-
The maximum channel of the current average reward of the probability selection of ε carries out channel idle detection；
If the channel idle testing result of S53, selected channel is the free time, channel is added 1 by selection number, channel it is total
Reward plus R1；If channel idle testing result be it is busy, channel is added 1 by selection number, and total reward of channel adds R2；
S54, cycle detection, until the n-th wheel has detected, then finally using the highest channel of average reward as the optimal free time
Channel.
Further, the channel idle detection in the step S5 is the energy by judging channel signal, if channel is believed
Number energy be lower than threshold value, then it is assumed that channel be it is idle, otherwise channel is busy.
After adopting the above technical scheme, the present invention at least has the following beneficial effects:
1, body area network is different from other wireless networks, there is that its some uniqueness, traditional inter-network interference avoid
Method, the characteristics of not being able to satisfy the mobility of body area network, and mobile phone mobile network is distributed unitedly by base station and is managed, this is in body domain
It is difficult to realize in net；Therefore, the invention enables body area networks to be adaptively adjusted, by current collected by each node and coordinator
Then body area network and the information for interfering related network index carry out channel selection and switching, institute to determine whether to be interfered
Some operations are completed by network itself, have real-time and adaptivity；
2, the detection of channel is each Channel Detection regular time in existing hop algorithm, detection average in this way,
Many times will be wasted in the detection of the channel of difference, and in Channel Detection, network can not communicate, therefore, detection letter
Road time-consuming is longer, bigger to the loss of body area network data, influences bigger；The model that the present invention is detected by establishing preferred channels,
It uses the idleness of channel as the judging basis of channel quality, is quickly found out optimal channel by establishing model and algorithm, makes
The fast quick-recovery normal communication of body area network is obtained, and keeps high-throughput and low time delay.
Detailed description of the invention
Fig. 1 is a kind of step flow chart for the method for avoiding interfering between wireless body area network of the present invention.
Specific embodiment
It should be noted that in the absence of conflict, the features in the embodiments and the embodiments of the present application can phase
It mutually combines, the application is described in further detail in the following with reference to the drawings and specific embodiments.
Embodiment
As shown in Figure 1, the present invention provides a kind of method for avoiding interfering between wireless body area network, step specifically:
In S1, body area network the measurement of each node with count related with network interferences performance parameter (including keep out of the way number and
Number of retransmissions), and send it to coordinator；
S2, coordinator receive the network interferences parameter of each node in network, are translated into delay parameter D, further according to
The time delay of each node and the significant coefficient of node obtain average network delay Dp；
S3, coordinator are handled up by the whole network that the data volume that is properly received in its unit time obtains present channel
Amount, obtains the received RSSI of signal (Received Signal Strength by the power of the data packet of successful reception
Indication received signal strength)
S4, coordinator combine the handling capacity of network and RSSI with the time delay of network, judge interference strength；Network throughput
Measure lower, network delay is bigger, and the interference being subject to is stronger, therefore when time delay arrives greatly more than certain value and handling capacity is as low as certain value
When, it is believed that interference especially severe can determine whether serious interference by threshold method, if it is serious to be interfered, entrance is next
Otherwise step S5 returns to step S1；
S5, coordinator circulation execute several wheels of following procedure to search preferred channels:
S51, coordinator set total Channel Detection wheel number n and total detection number of channel k, initialize the quilt of each channel
Select the average reward of number and each channel；
S52, each round detection, coordinator randomly chooses a channel with ε probability and carries out channel idle detection, with 1- ε's
The maximum channel of the current average reward of probability selection carries out channel idle detection；
If the channel idle testing result of S53, selected channel is the free time, channel adds 1 by selection number, channel
Total reward plus R1；If channel idle testing result be it is busy, channel is added 1 by selection number, and total reward of channel adds R2；
S54, it is continued until that several wheels have detected, then finally using the highest channel of average reward as optimal channel；
S6, coordinator the node broadcasts tone hopping information all to the body area network allow whole network to be adjusted to new idle letter
On road, returns to step S1 and carry out loop cycle.
In order to enable the accuracy of data, the present invention provides a specific examples to operate above-mentioned steps, specifically:
S1, sensor node use CC2530 chip, transplant TinyOS operating system, and sensor node acquires data, often
The data packet that a size is 100 bytes, transmission rate 40kbps are transmitted to coordinator every 20ms.It sets in CSMA/CA most
Big random back times N Bmax is 3, and minimum index avoidance BEmin is 2, and maximum index avoidance is 5, one data of every transmission
It wraps and adds the value for keeping out of the way number and number of retransmissions of two bytes at end；
S2, coordinator obtain the average delay Dp of body area network using calculating formula 1 and calculating formula 2；
Calculating formula 1:
Calculating formula 2:
S3, coordinator count the handling capacity T of entire body area network and receive the intensity RSSI of signal；
S4, delay threshold is set as Dthreshold=15ms, handling capacity delay threshold are Tthreshold=28packets,
The threshold value RSSI of RSSIthresholdFor RSSI normal communication value -60dB, coordinator judges whether handling capacity T > Tthreshold&& time delay
Dp>Dthreshold&&RSSI>RSSIthresholdIf the above results are very, to determine body area network by serious cochannel body domain
Interference between net, into next step S5；Otherwise, step S1 is returned to；
S5, set that explore channel be 3, total detection wheel number is 300, and every wheel executes a channel idle and detects, and every wheel consumes
When be 8 total 128us of byte, total detection time is 38ms, initializes the putting down by selection number and each channel of each channel
Reward is 0；Each round detection, coordinator randomly chooses a channel with 0.1 probability and carries out channel idle detection, with 0.9
The maximum channel of the current average reward of probability selection carries out channel idle detection；If selected channel idle testing result is sky
Spare time, then channel is added 1 by selection number, total reward of channel plus 1；If channel idle testing result be it is busy, channel
Add 1 by selection number, the always reward of channel is constant；It is continued until that 300 wheels have detected, then the highest channel of final average reward
For most idle channel；
S6, coordinator the node broadcasts tone hopping information all to the body area network allow whole network to be adjusted to new idle letter
On road, returns to step S1 and carry out loop cycle.
It although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, can be with
Understand, these embodiments can be carried out with a variety of equivalent changes without departing from the principles and spirit of the present invention
Change, modification, replacement and variant, the scope of the present invention is defined by the appended claims and their equivalents.
Claims (5)
1. a kind of method for avoiding interfering between wireless body area network, which comprises the steps of:
The network interferences parameter of each node in S1, measurement and statistics body area network, and network interferences parameter is sent to coordinator；
Received network interferences parameter is converted delay parameter D by S2, coordinator, further according to node each in body area network when
The significant coefficient for prolonging parameter D and node seeks average delay Dp；
S3, coordinator measure the handling capacity of the whole network of present channel by successful data reception in its unit time, and
Received signal strength is obtained by the power of successful data reception packet；
S4, coordinator combine the handling capacity of network and received signal strength with average delay Dp, judge interference strength；Its
In, network throughput is lower, and network delay is bigger, and the interference being subject to is stronger, therefore when average delay Dp is more than certain value and is gulped down
When the amount of spitting is as low as certain value, then judge to interfere especially severe；When judging interference strength, if the serious interference being subject to, into
Enter next step S5, otherwise returns to step S1；
S5, coordinator carry out channel idle detection to channel, repeat to detect n wheel, each round detection is required in k channel
One is detected, and by the sequence of algorithm reasonable arrangement Channel Detection, quickly obtains optimal idle channel；Specifically:
S51, coordinator set total Channel Detection wheel number as n and total detection number of channel k, initialize the selected of each channel
Select the average reward of number and each channel；
S52, in each round detection, coordinator randomly chooses channel with ε probability and carries out channel idle detection, with 1- ε's
The maximum channel of the current average reward of probability selection carries out channel idle detection；
If the channel idle testing result of S53, selected channel is the free time, channel is added 1 by selection number, total reward of channel
Add R1；If channel idle testing result be it is busy, channel is added 1 by selection number, and total reward of channel adds R2；
S54, cycle detection, until the n-th wheel has detected, then finally using the highest channel of average reward as optimal free time letter
Road；
All node broadcasts Frequency Hopping Signals of S6, coordinator into this body area network change locating for frequency to optimal idle channel
Frequency, so that whole network is adjusted on optimal idle channel, then return step S1 carries out loop cycle.
2. a kind of method for avoiding interfering between wireless body area network according to claim 1, which is characterized in that the step S1
Network interferences parameter include keep out of the way number and number of retransmissions.
3. a kind of method for avoiding interfering between wireless body area network according to claim 1, which is characterized in that the step S2
Delay parameter D and average time delay D p, calculation are as follows:
Wherein the characteristics of non-slot CSMA/CA is utilized in delay parameter D, is calculated according to the following formula:
In formula, nb indicates to keep out of the way number, W in CSMA/CA agreementnbIndicate contention window size, TslotIndicate what unit was kept out of the way
Slot length；The formula is used to calculate one when backoff state is nb and average keeps out of the way time-consuming；
In formula,It indicates average and keeps out of the way number,Indicate that number of retransmissions, N indicate maximum allowable and keep out of the way number；The formula indicates
Keep out of the way number and average repeat time using being averaged for node transmission, estimation obtains the average delay D of the node-node transmission；
In formula, αiIndicate that the significant coefficient of node i, k represent total number of nodes；The importance for considering each node of whole network, obtains
The average delay D based on node priority of network entiretyp。
4. a kind of method for avoiding interfering between wireless body area network according to claim 1, which is characterized in that the step S4
In, when judging interference strength, determined whether using threshold method it is heavily disturbed, specifically: when handling capacity is lower than handling up
Measure threshold value, average delay be higher than average delay threshold value, and received signal strength be greater than received signal strength threshold value when, it is believed that
The serious interference being subject to；Coordinator determines the threshold value and averagely time delay D p of handling capacity according to the data volume that each node of network is sent
Threshold value, coordinator measures network throughput T noiseless under, setting factor alpha, using α × T as the threshold value of handling capacity；Association
It adjusts device to measure the average delay Dpt under noiseless, factor beta is set, using β × Dpt as the threshold value of average delay Dpt；Test
Unobstructed lower received signal strength indication is rssi1, and the received signal strength indication tested under single barrier blocks is rssi2, if
The threshold value for determining received signal strength is rssi1- γ × rssi1+ γ × rssi2, and coefficient gamma ∈ [0,1] is body area network to blocking
Tolerance.
5. a kind of method for avoiding interfering between wireless body area network according to claim 1, which is characterized in that the step S5
In channel idle detection be energy by judge channel signal, if the energy of channel signal is lower than threshold value, then it is assumed that believe
Road be it is idle, otherwise channel is busy.
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| CN109462858A (en) * | 2017-11-08 | 2019-03-12 | 北京邮电大学 | A kind of wireless sensor network parameter adaptive adjusting method |
| CN109936853B (en) * | 2019-01-29 | 2020-10-27 | 华南理工大学 | Method for avoiding interference between wireless body area networks |
| CN110266416A (en) * | 2019-07-01 | 2019-09-20 | 东北大学秦皇岛分校 | A kind of double-deck multi-channel scheduling MAC protocol coexisted towards multiple wireless body area networks |
| CN114071433B (en) * | 2020-07-30 | 2023-06-02 | 西门子（中国）有限公司 | Anti-interference method, device and system for Zigbee network |
| CN112054855A (en) * | 2020-09-14 | 2020-12-08 | 中国科学技术大学 | Wireless body area network interference mitigation method based on moving track similarity |
| CN113472455B (en) * | 2021-06-11 | 2022-12-16 | 江苏大学 | Method for self-adaptively reducing interference between wireless body area networks |
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